Other assetsAccrued Interest and Other AssetsThis element represents the fair value of accrued interest and other assets of the entity.Other liabilitiesAccrued Interest and Other LiabilitiesThis element represents the fair value of accrued interest and other liabilities of the entity.Debit card interchange incomeCard Interchange Income DebitIncome earned from debit card services for the reporting period.Death Benefit Realized on Bank Owned Life InsuranceDeath benefit including interest realized on bank-owned life insuranceRepresents the death benefit realized from bank owned life insurance during the reporting period.Debit card interchange expenseDebit Card Interchange ExpenseThis element represents the debit card interchange expense.Other real estate expenseOther Real Estate Owned ExpenseThis element represents the other real estate owned expense during the period.Award Type [Axis]Share and Per Share Information [Abstract]Share and per share information:Change in accrued interest receivable and other assetsIncrease (Decrease) in Accrued Interest Receivable and Other AssetsChange in accrued interest receivable and other assetsThe net change during the reporting period in accrued interest receivable and other assets.Change in accrued interest payable and other liabilitiesIncrease (Decrease) in Accrued Interest Payable and Other LiabilitiesThe net change during the reporting period in accrued interest payable and other liabilities.Death Claim on Bank Owned Life InsuranceDeath claim on bank-owned life insuranceRepresents the death claim from bank owned life insurance during the reporting period.Amendment DescriptionTax benefit from dividend equivalent paymentTax Benefit from Payments of DividendTax benefit from dividend equivalent payment.Amendment FlagThe amount of cash paid during the current period for interest on deposits.Interest Paid for DepositsInterest paid for depositsAccretion on Preferred Stock WarrantsAccretion on preferred stock warrantsThis element represents, cash flow during the year in respect to accretion on preferred stock warrants of the reporting entity.Non-cash transfer of notes payable to short-term borrowingsTransfer Other Short Term BorrowingsThis element represents Non-cash transfer of notes payable to other short-term borrowings.Non-cash transfer related to deferred taxes on goodwillTransfer to Deferred Taxes on GoodwillThis element represents Non-cash transfer related to deferred taxes on goodwill.Adoption of mark to market of mortgage servicing rightsAdoption of Mark to Market of Mortgage Servicing RightsThis element represents the effect of adoption of mark to market of mortgage servicing rights on retained earnings.Adjustments to Additional Paid in Capital, Tax Effect from Dividend Equivalent PaymentsThis element represents adjustment to additional paid in capital due to tax effect of dividend equivalent payments.Tax benefit of dividend equivalent paymentsLoansLoansLoans [Text Block]The disclosure of loans receivables.Allowance for Loan LossesAllowance for Loan Losses [Text Block]The disclosure of the allowance for loan losses, including a rollforward reconciliation from the beginning of the period to the end of the period.Allowance for Loan LossesFair Values of Financial InstrumentsFair Values of Financial Instruments Disclosure [Text Block]Fair Values of Financial InstrumentsThis element represents disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value.Document and Entity InformationCash and Due from Banks Disclosure [Text Block]Cash and Due from BanksDisclosure for banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.Stockholders' Rights PlanMortgage Servicing Rights and Loans Held for SaleCurrent Fiscal Year End DateMortgage Servicing Rights and Loans Held For sale Disclosure [Text Block]Mortgage Servicing Rights and Loans Held-for-SaleThe entire disclosure for a transferor's continuing involvement in financial assets that it has transferred in a securitization or asset-backed financing arrangement, the nature of any restrictions on assets reported by an entity in its statement of financial position that relate to a transferred financial asset (including the carrying amounts of such assets), how servicing assets and servicing liabilities are reported, and (for securitization or asset-backed financing arrangements accounted for as sales) when a transferor has continuing involvement with the transferred financial assets and transfers of financial assets accounted for as secured borrowings, how the transfer of financial assets affects an entity's financial position, financial performance, and cash flows and disclosure in respect of total loans held for sale, loans held for investment, real estate loan and allowance for all types of loan receivable losses.Stockholders Rights Plan Disclosure [Text Block]Stockholders' Rights PlanDisclosure of Stockholder's right plan adopted by entity during the reporting period. It may includes distribution of specific number of right shares for each share of company's outstanding common stock.Mortgage Banking DerivativesMortgage Banking DerivativesDisclosure of Derivatives contracts entered by entity during the reporting period. It includes forward contracts, interest rate lock commitments and fair value hedges of loans held for sale.Mortgage Banking Derivatives Disclosure [Text Block]Amortization and Recovery of Mortgage Servicing Rights, NetAmortization and recovery of mortgage servicing rights, netAmount of amortization and recovery of Mortgage Servicing Rights during the period.Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate LossesLess than 12 months in an unrealized loss positionGain (Loss) on Transfer of Property to Other Real EstateLoss on transfer of premises to other real estate ownedThe net gain (loss) resulting from transfer of property to of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate during the reporting period.Non-cash transfer of loans to other real estate ownedThis element represents the non cash transfer of loans to other real estate owned during the reporting period."Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.Non Cash Transfer of Premises to Other Real Estate OwnedOther Real Estate Valuation Allowance Roll Forward [Table Text Block]Schedule of activity in valuation allowanceTabular disclosure of the change in valuation allowance of other real estate on properties acquired through foreclosure.Other Real Estate Expenses Related to Foreclosed Assets [Table Text Block]Schedule of expenses related to foreclosed assets, net of lease revenueTabular disclosure of expenses related to foreclosed assets, net of lease revenue. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.Real Estate Owned Valuation Allowance Other AdjustmentsOther adjustmentsRepresents other adjustments to the amount of valuation allowance for the real estate owned during the period.Foreclosed Real Estate Expense Net of Lease RevenueExpenses related to foreclosed assets, net of lease revenueAmount of expense recognized during the period for real estate assets acquired through foreclosure, net of lease revenue.Document Period End DateOther Real Estate Owned Expenses Related to Foreclosed Assets [Abstract]Expenses related to foreclosed assets, net of lease revenueSchedule of Deposits [Table Text Block]Schedule of major classifications of depositsTabular disclosure of different types of deposits liabilities held by the entity.Time Deposits, Less than $250,000Certificates of deposit of less than $250,000The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of less than 250,000 dollars.The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of 250,000 dollars or more.Certificates of deposit of $250,000 or moreTime Deposits, $250,000 or MoreSchedule of Collateralized Debt Obligations [Table Text Block]Schedule of additional information relating to the collateralized debt obligations (CDO)Tabular disclosure of information relating to collateralized debt obligations, Trapeza 2007-13A, which is secured by a pool of trust preferred securities issued by trusts sponsored by multiple financial institutions.Mortgage Backed Securities, Issued by US Government Agencies [Member]U.S. government agency mortgage-backedDebt securities collateralized by real estate mortgage loans (mortgages), issued by US government agencies, for example, but not limited to, Government National Mortgage Association (GNMA or Ginnie Mae). Excludes US treasury securities and debt issued by government-sponsored Enterprises (GSEs), for example, but is not limited to, Federal Home Loan Mortgage Corporation (FHLMC or Freddie Mac), Federal National Mortgage Association (FNMA or Fannie Mae), and the Federal Home Loan Bank (FHLB).Increase (Decrease) in Federal Home Loan Bank StockDecrease in FHLBC stockRepresents the increase (decrease) in Federal Home Loan Bank stock during the period.Debt securities excluding securities not due at a single maturity dateAmortized cost of debt securities categorized neither as held-to-maturity nor trading. This item represents the total amortized cost of all debt securities grouped by maturity dates, excluding the securities with no single maturity date.Available For Sale Debt Maturities, before Securities without Single Maturity Date, Amortized Cost BasisDerivative, Notional AmountNotional or Contractual AmountAvailable For Sale Securities, Weighted Average Yield, Rolling Maturity [Abstract]Weighted Average YieldEntity [Domain]Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate LossesTotalAvailable For Sale Securities, Debt Maturities, Next Rolling Twelve Months Weighted Average YieldDue in one year or less (as a percent)Represents the weighted average yield of available-for-sale debt securities maturing in the next rolling twelve months following the latest balance sheet presented.Available For Sale Securities, Debt Maturities, Rolling Year Two Through Five, Weighted Average YieldDue after one year through five years (as a percent)Represents the weighted average yield of available-for-sale debt securities maturing in the second rolling twelve months through the fifth rolling twelve months following the latest balance sheet presented.Available For Sale Securities, Debt Maturities, Rolling Year Six Through Ten, Weighted Average YieldDue after five years through ten years (as a percent)Represents the weighted average yield of available-for-sale debt securities maturing in the sixth rolling twelve months through the tenth rolling twelve months following the latest balance sheet presented.Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate LossesGreater than 12 months in an unrealized loss positionAvailable for Sale Securities, Debt Maturities, Rolling after Year Ten, Weighted Average YieldDue after ten years (as a percent)Represents the weighted average yield of available-for-sale debt securities maturing after the tenth rolling twelve months following the latest balance sheet presented.Available For Sale Debt Maturities, before Securities without Single Maturity Date, Weighted Average YieldDebt securities (as a percent)Represents the weighted average yield of available-for-sale debt securities maturing after the tenth rolling twelve months following the latest balance sheet presented. This item represents the weighted average yield of all debt securities grouped by maturity dates, excluding the securities with no single maturity date.Represents the amount of available-for-sale securities as a percentage of stockholder's equity.Available For Sale Securities, as Percentage of Stockholders EquityAmount of available-for-sale securities as a percentage of stockholder's equityAvailable For Sale Securities, Debt Maturities, without Single Maturity Date, Weighted Average YieldSecurities not due at a single maturity date, Weighted Average Yield (as a percent)Represents the weighted average yield of available-for-sale debt securities that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the cost over several maturity groupings.Available For Sale Equity Securities, Weighted Average YieldEquity securities (as a percent)Represents the weighted average yield of available-for-sale equity securities.Available For Sale Securities, Weighted Average YieldTotal (as a percent)Represents the weighted average yield of available-for-sale securities.Available For Sale Debt Maturities, before Securities without Single Maturity Date, Fair ValueFair value of debt securities categorized neither as held-to-maturity nor trading. This item represents the total fair value of all debt securities grouped by maturity dates, excluding the securities with no single maturity date.Debt securitiesLess than 12 months in an unrealized loss positionAvailable For Sale, Securities in Unrealized Loss Position, Less than 12 Months, Qualitative Disclosure, Number of PositionsRepresents the number of investment positions of securities categorized neither as held-to-maturity nor trading securities, that have been in a loss position for less than twelve months.Available For Sale, Securities in Unrealized Loss Positions, 12 Months or Longer, Qualitative Disclosure, Number of PositionsGreater than 12 months in an unrealized loss positionRepresents the number of investment positions of securities categorized neither as held-to-maturity nor trading securities, that have been in a loss position for twelve months or longer.Collateralized Debt Obligation Class A1 [Member]Class A1Represents the class A1 of collateralized debt obligations.Collateralized Debt Obligation Class A2A [Member]Class A2ARepresents the class A2A of collateralized debt obligations.Available For Sale Securities, Number of Banks in IssuanceNumber of Banks in IssuanceRepresents the number of banks in issuance relating to available-for-sale securities.Available-for-sale Securities, Gross Unrealized GainsGross Unrealized GainsAvailable For Sale Securities, Issuance Deferrals and Defaults AmountIssuance Deferrals & Defaults, AmountRepresents the amount of deferrals and defaults in issuance relating to available-for-sale securities.Available For Sale Securities, Issuance Deferrals and Defaults Collateral PercentageIssuance Deferrals & Defaults, Collateral (as a percent)Represents the deferrals and defaults in issuance collateralized as a percent, relating to available-for-sale securities.Available For Sale Securities, Issuance Excess Subordination Collateral PercentageIssuance Excess Subordination, Collateral (as a percent)Represents the excess subordination in issuance collateralized as a percent, relating to available-for-sale securities.Available For Sale Securities, Issuance Excess Subordination AmountIssuance Excess Subordination, AmountRepresents the amount of excess subordination in issuance relating to available-for-sale securities.Credit Facility [Member]Credit facility with LaSalle Bank National Association (now Bank of America)Represents the credit facility available from a bank, which consisted of senior debt facility and subordinated debt.Bank of America credit facility, subordinated debtTerm Debt [Member]Term debtRepresents the term loan under the credit facility.Debt Instrument Maturity TermMaturityRepresents the maturity term of the debt instrument.Securities Sold under Agreements to Repurchase Number of Reporting PeriodNumber of reporting periodsRepresents the number of reporting period for securities sold under agreement to repurchase.Federal Home Loan Bank, Advances as Percentage of Total AssetsBorrowings at FHLBC as percentage of total assetsRepresents the amount of borrowings from Federal Home Loan Bank as a percentage of total assets.Debt Instrument, Increase in Interest Rate on Non Compliance of Financial CovenantIncrease in basis points on non compliance of covenant (as a percent)Represents the increase in basis points retroactive to July 30, 2009 due to the bank invoking the default rate on the debt instrument.Federal Home Loan Bank, Advances as Percentage of Book Value of Certain Mortgage LoansBorrowings at FHLBC as percentage of book value of certain mortgage loansRepresents the amount of borrowings from Federal Home Loan Bank as a percentage of book value of certain mortgage loans.Number of Financial Covenants Out of ComplianceNumber of financial covenants for which the entity continued to be out of complianceRepresents the number of financial covenants contained within the credit agreement for which the entity continued to be out of compliance.Term of Written Strategic PlanWritten strategic plan termRepresents the term of the entity's written strategic plan.Increase in Tier One Leverage CapitalTier One leverage ratio, basis point increase (as a percent)Represents the basis point increase in the Tier One leverage capital over prior period.Number of Classifications for Prompt Corrective Action RegulationsNumber of classifications for prompt corrective action regulationsRepresents the number of classifications for prompt corrective action regulations including well capitalized, adequately capitalized, undercapitalized, significantly undercapitalized and critically undercapitalized.Actual over target Tier One leverage ratio, basis point increase (as a percent)Represents the basis point increase in the actual Tier One leverage capital over target Tier One leverage capital.Tier One Leverage Capital Actual over Tier One Leverage Capital TargetIncrease in Capital to Risk Weighted Assets RatioRisk-based capital ratio, basis point increase (as a percent)Represents the basis point increase in the risk-based capital ratio over prior period.Risk Based Capital Ratio Actual over Risk Based Capital Ratio TargetActual over target risk-based capital ratio, basis point increase (as a percent)Represents the basis point increase in the actual risk-based capital ratio over the target risk-based capital ratio.Capital to Risk Based Ratios [Abstract]Total capital to risk weighted assets, RatioProceeds from Trust Preferred Securities Qualifying as Tier One CapitalTrust preferred proceeds qualified as Tier 1 regulatory capitalRepresents the amount of trust preferred proceeds that qualify as Tier 1 regulatory capital.Proceeds from Trust Preferred Securities Qualifying as Tier Two CapitalTrust preferred proceeds qualified as Tier 2 regulatory capitalRepresents the amount of trust preferred proceeds that qualify as Tier 2 regulatory capital.Dividend Restrictions and Deferrals [Abstract]Dividend Restrictions and DeferralsDividend Restrictions, Number of Previous Years Retained ProfitNumber of previous years retained profit considered for dividend paymentRepresents the number of previous years retained profits combined with the current years profits used to determine the amount of dividends that may be paid in any calendar year.Number of Statutory Business Trusts Holding Junior Subordinated DebenturesNumber of statutory business trusts that hold junior subordinated debenturesRepresents the number of statutory business trusts controlled by the entity that hold junior subordinated debentures.Annual Interest Expense Junior Subordinated Debentures that Can be DeferredInterest payment per year, approximateRepresents the amount of interest expense that may be paid every year on junior subordinated debentures.Junior Subordinated Debenture Deferred Unpaid InterestTotal accumulated unpaid interest including compounded interestRepresents the total amount of deferred and unpaid interest on junior subordinated debentures.Total amount of deferred and unpaid interestPreferred Stock, Dividend Rate, Percentage for First Five YearsCumulative dividends, initial rate for the first five years (as a percent)The percentage of cumulative dividends on the liquidation preference amount of preferred stock for the first five years.Preferred Stock Dividend, Initial Rate PeriodRepresents the time period for payment of the quarterly cumulative dividend payment based on the initial rate.Period for payment of cumulative dividends using the initial cumulative dividend rateClass of Warrant or Right TermWarrants, termPeriod representing the term of warrant.Summary of Significant Accounting PoliciesPreferred Stock, Dividend Rate, Percentage after First Five YearsCumulative dividends rate, thereafter (as a percent)The percentage of cumulative dividends on the liquidation preference amount of preferred stock after the first five years.Preferred Stock Number of Quarters Dividends in ArrearsNumber of quarters in which if the Company did not pay dividends, will allow the holder the right to appoint representatives to the Company's board of directorsRepresents the number of quarters for which dividends are not paid and which gives the holder the right to appoint representatives to the Company's board of directors.Entity Well-known Seasoned IssuerNumber of Directors to be Appointed in Board by TreasuryNumber of directors to be appointed by Treasury to boardRepresents the number of directors to be appointed by Treasury in the entity's board.Entity Voluntary FilersSchedule of Contractual Commitments Due to Letters of Credit [Table Text Block]Schedule of contractual commitments due to letters of creditTabular disclosure of the entity's contractual commitments due to letters of credit commitments that relate to properties held in other real estate owned.Entity Current Reporting StatusDerivative Commitments [Member]CommitmentsRepresents details pertaining to commitments which includes, unused loan commitments, interest rate lock commitments, forward rate lock and mortgage-backed securities commitments.Entity Filer CategoryRisk Participation Agreements [Member]Risk participation agreementsRepresents the risk participation agreements entered into by the entity.Entity Public FloatNumber of Financial Institutions Investment Securities PledgedInvestment securities pledged with financial institutions, numberRepresents the number of financial institutions where investment securities are pledged.Entity Registrant NameCommitments to Extend Credit to Borrowers [Member]Commitments to extend credit: borrowersRepresents the loan commitments to borrowers that are legally binding commitments to extend credit to counterparty under certain terms and conditions.Entity Central Index KeyCommitments to Extend Credit to Others [Member]Commitments to extend credit: otherRepresents the loan commitments to other than borrowers that are legally binding commitments to extend credit to counterparty under certain terms and conditions.Loans Including Loans Held For Sale, Fair Value DisclosureLoans held for saleRepresents the fair value of loan and loans held-for-sale as presented on the statement of financial position which may include mortgage loans , finance receivables held, policy loans on insurance contracts, or any other loans which are due the Company as of the balance sheet date.Forward Loan Commitments Fair Value DisclosureForward loan commitments to investorsRepresents the fair value of forward loan commitments made to investors.Old Second Capital Trust IRepresents Old Second Capital Trust I, an unconsolidated subsidiary of the entity.Old Second Capital Trust I [Member]Entity Common Stock, Shares OutstandingTrust Preferred Securities Issuance Cost Amortization PeriodAmortization periodRepresents the amortization period of the costs associated with the issuance of the trust preferred securities.Trust Preferred Securities Maturity PeriodMaturity PeriodRepresents the maturity period of trust preferred securities.Receivable Type [Axis]Interest Payment Deferment PeriodPeriod of interest payments that may be deferred (in quarters)The period up to which the interest payments may be deferred.Number of quarterly periods for deferral of interestTrust Preferred Securities Cash Distribution Rate PercentageCash distribution rate of trust preferred securities (as a percent)Represents the annual rate of cash distributions on the securities, which are payable quarterly.Trust Preferred Securities, Cash Distribution Fixed Rate PercentageRepresents the fixed annual rate of cash distributions on the securities.Cash distribution fixed rate of trust preferred securities (as a percent)Trust Preferred Securities Basis Spread on Variable RateBasis points added to cash distribution floating rate base (as a percent)The percentage points added to the reference rate to compute the variable rate on the trust preferred securities.Trust Preferred Securities Description of Variable Rate BasisCash distribution, floating rate baseThe reference rate for the variable rate of the trust preferred securities, such as LIBOR or the US treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.Old Second Capital Trust II [Member]Old Second Capital Trust IIRepresents Old Second Capital Trust II, an unconsolidated subsidiary of the entity.Tabular disclosure of financing receivables modified by troubled debt restructurings that subsequently default.Schedule of TDRs that subsequently defaultedSchedule of Financing Receivable Modifications Subsequent Payment Default [Table Text Block]Other Financing Receivable [Member]OtherRepresents the class of financing receivables related to other financing receivables.Loans and Leases Receivable as Percentage of Aggregate PortfolioLoans receivable as a percentage of total portfolioRepresents the percentage of total portfolio that is represented by a particular financial receivable category.Commercial Real Estate, Owner Occupied General Purpose Loan [Member]Owner occupied general purposeRepresents the class of financing receivable related to commercial real estate occupied by owner, for general purpose.Commercial Real Estate Owner Occupied Special Purpose Loan [Member]Owner occupied special purposeRepresents the class of financing receivable related to commercial real estate occupied by owner, for special purpose includes loans collateralized by property types such as gas stations, health and fitness centers, golf courses, restaurants, and medical office buildings.Commercial Real Estate, Non Owner Occupied General Purpose Loan [Member]Non-owner occupied general purposeRepresents the class of financing receivable related to commercial real estate occupied by non-owner, for general purpose include credits that are collateralized by office, warehouse, and industrial properties.Commercial Real Estate, Non Owner Occupied Special Purpose Loan [Member]Non-owner occupied special purposeRepresents the class of financing receivable related to commercial real estate occupied by non-owner, for special purpose.Commercial Real Estate, Retail Properties Loan [Member]Retail propertiesRepresents the class of financing receivable related to commercial real estate retail properties.Commercial Real Estate, Farm Loan [Member]FarmRepresents the class of financing receivable related to commercial real estate farm.Document Fiscal Year FocusConstruction Real Estate, Homebuilder Loan [Member]HomebuilderRepresents the class of financing receivable related to homebuilder construction real estate.Document Fiscal Period FocusConstruction Real Estate, Land Loan [Member]LandRepresents the class of financing receivable related to construction real estate land.Construction Real Estate, Commercial Speculative Loan [Member]Commercial speculativeRepresents the class of financing receivable related to commercial speculative construction real estate.Construction Real Estate, Other Receivable [Member]All otherRepresents the class of financing receivable related to construction real estate which includes other construction real estate loan.Residential Investor Loan [Member]InvestorRepresents the class of financing receivable related to investor loan on residential real estate.Residential Owner Occupied Loan [Member]Owner occupiedRepresents the class of financing receivable related to residential owner occupied real estate.Residential Revolving and Junior Liens Loan [Member]Revolving and junior liensRepresents the class of financing receivable related to residential revolving and junior lien real estate.Related AllowanceImpaired Financing Receivable Related Allowance [Abstract]Financing Receivable by Accrual Status [Axis]Information of financing receivable by accrual status.Financing Receivable Restructuring [Axis]Information by basis of restructuring of financing receivables.Financing Receivable Accrual Status [Domain]Accrual status of financing receivable.Financing Receivable Restructuring [Domain]Various conditions under which financing receivables being modified.Legal Entity [Axis]Accrual [Member]Accruing interestInformation pertaining to the financing receivables with accruing interest.Document TypeNonaccrual [Member]NonaccrualInformation pertaining to the financing receivables that are on nonaccrual status.Bifurcate [Member]Represents financing receivables restructured to an "A/B" restructure separated into two notes, charging off the entire B portion of the note.BifurcateHome Affordable Modification Program [Member]Represents financing receivables restructured under Home Affordable Modification Program (HAMP).HAMPDeferral [Member]Represents financing receivables restructured to the deferral of principal.DeferralFinancing Receivable Modifications Outstanding [Abstract]TDR's outstandingFinancing Receivable Modifications [Abstract]TDR's modifiedFinancing Receivable, Modifications, Subsequent Payment Default [Abstract]TDR's defaultedFinancing Receivable, Modifications, Subsequent Payment Default, Recorded InvestmentPre-modification outstanding recorded investmentNumber of financing receivables during the period that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.Financing Receivable, Modification, Number of Contracts# of contractsThe number of financing receivables that have been modified during the period by troubled debt restructurings.Financing Receivable, Modifications, Subsequent Payment Default, Number of Contracts# of contractsNumber of financing receivables that have been modified by troubled debt restructurings during the period.Financing Receivable, Pre Modification Recorded InvestmentPre-modification recorded investmentThe amount of the outstanding recorded investment related to financing receivables that have been modified during the period by troubled debt restructurings before the financing receivable has been modified.Financing Receivable, Post Modification Recorded InvestmentPost-modification recorded investmentThe amount of the outstanding recorded investment related to financing receivables that have been modified during the period by troubled debt restructurings after the financing receivable has been modified.Restricted Stock and Restricted Stock Units [Member]Restricted stock and restricted stock unitsRestricted stock and restricted stock units awarded by the company to its employees as a form of incentive compensation.Share Based Compensation Arrangement by Share Based Payment Award, Expiration TermTerm of stock options grantedThe period of time, from the grant date until the time at which the share-based award expires.Weighted Average Remaining Contractual Term (in years)Share Based Compensation Arrangement by Share Based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract]Share Based Compensation Arrangement by Share Based Payment Award, Aggregate Intrinsic Value [Abstract]Aggregate Intrinsic ValueSchedule of changes in Level 3 assets and liabilities measured at fair value on a recurring basisSchedule of Fair Value Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Table Text Block]Tabular disclosure of the fair value measurement of assets and liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income, and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset or liability.Fair Value Assets Reported in Level One Purchase PeriodPurchase period from year end of assets reported in level one (in days)Represents the purchase period from year end of assets reported in level one.Schedule of information required and determined to be provided for purposes of reconciling beginning and ending balances of fair value measurements of assets and liabilities using significant unobservable inputs (level 3). Such reconciliation, separately presenting changes during the period, at a minimum, may include, but is not limited to: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income, and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset and liability.Fair Value Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Table]Mortgage Servicing Rights [Member]Mortgage servicing rightsRepresents the mortgage servicing rights.Fair Value Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]Assets and liabilities measured at fair value on a recurring basisDisclosure pertaining to the entity's basic and diluted earnings per share.Schedule of Earnings Per Share Basic and Diluted [Table]Weighted Average Number of Share Based Payment AwardsWeighted-average common shares stock based awardsNumber of shares of stock based awards determined by relating the portion of time within a reporting period that stock based awards have been outstanding to the total time in that period.Earnings Per Share Basic and Diluted [Line Items]Earnings per common shareWeighted Average Number of Shares Outstanding Excluding Share Based Payment AwardsWeighted-average common shares less stock based awardsRepresents the aggregate number of basic shares or units reduced by stock based awards.Federal Reserve Bank, Treasury Tax and Loan Deposits [Member]TT&L deposits with FRBRepresents the treasury tax and loan deposits held for the Federal Reserve Bank.Senior Debt Facility [Member]Represents the senior debt facility which consists of a revolving line of credit, a term loan and subordinated debt.Senior debt facilityFair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Gain (Loss) [Abstract]Total gains or lossesFair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Liability Gain (Loss) [Abstract]Total gains or lossesAccounts, Notes, Loans and Financing Receivable [Line Items]LoansFair Value Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, ExpirationsExpirations that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.ExpirationsExpirations that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.ExpirationsFair Value Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, ExpirationsImpaired Loans [Member]Impaired loansRepresents the impaired loans measured at fair value on a nonrecurring basis.Other Real Estate Owned [Member]Other real estate ownedRepresents the other real estate owned measured at fair value on a nonrecurring basis.Impaired Financing Receivable Decrease of Specific Allocations within Provision for Loan LossesIncrease/decrease of specific allocations within the allowance for loan lossesRepresents the amount of increase (decrease) in specific allocations within the provision for loan losses for impaired financing receivables.Loans Fully Charged Carrying ValueCarrying value of loans fully chargedRepresents the amount of carrying value of loans, fully charged off.Real Estate, GrossOutstanding balanceRepresents the gross carrying amount of real estate owned before the valuation allowance.Schedule of Troubled Debt Restructurings on Financing Receivables by Type of Modification [Table Text Block]Tabular disclosure of financing receivables classified as troubled debt restructurings by type of modification.Schedule of TDRs modified during the period by type of modificationTotal real estateReal Estate Portfolio Segment [Member]Portfolio segment of the company's total financing receivable related to real estate including commercial and residential.Outstanding Loan Commitments Threshold for Credit Quality CategorizingThe outstanding loan commitment to be included in credit quality indicator analysis.Loan commitment for inclusion in credit quality analysisOther Regulatory Capital Information [Abstract]Other regulatory capital informationDebt Instrument, Variable Rate Base [Axis]The alternative reference rates that may be used to calculate the variable interest rate of the debt instrument.Debt Instrument, Variable Rate Base [Domain]Identification of the reference rate that is used to calculate the variable interest rate of the debt instrument.Debt Instrument, Variable Rate Base LIBOR [Member]The London Interbank Offered Rate (LIBOR) used to calculate the variable interest rate of the debt instrument.LIBORDeposits Variable Rate Reduction of Basis PointsThe percentage points subtracted from the reference rate to compute the variable rate on the deposits.Basis points subtracted from reference rateDeposits Description of Variable Rate BasisThe reference rate of the deposits such as LIBOR or the US Treasury rate.Variable interest rate baseSchedule of Preferred Stock [Table]Schedule detailing information related to preferred stock and warrants.Preferred Stock [Line Items]Common and preferred stockRelated tax (expense) benefitOther Comprehensive Income Available For Sale Securities Tax Portion on Net Unrealized Gains Attributable to ParentTax effect of the unrealised appreciation or the unrealised loss, before reclassification adjustment, in the change in value of available for sale securities during the period that is attributable to the parent entity.Holding income (loss) after taxOther Comprehensive Income (Loss) Net of Tax Portion of Unrealized Gains Attributable to ParentThis element represents Other Comprehensive Income or Loss, Net of Tax, for the period attributable to the parent entity after deducting tax portion of unrealized gains.Realized gains (losses) by security type:Other Comprehensive Income, Available For Sale Securities Adjustment for Realized Gain (Loss), Net of Tax Period Increase (Decrease) [Abstract]Net realized gains (losses)Other Comprehensive Income, Realized Holding Gain (Loss) on Securities, Arising During Period before TaxAppreciation or the gross loss in value of the total of realised available-for-sale securities during the period being reported before deduction of tax.Accretion (Amortization) of Discounts and Premiums, InvestmentsNet premium amortization on securitiesIncome tax (expense) benefit on net realized gainsOther Comprehensive Income Available-for-sale Securities Tax Portion on Net Realized Gains Attributable to ParentTax effect of the realised gain or the realised loss, net of reclassification adjustment, in the change in value of available for sale securities during the period that is attributable to the parent entity.Net realized gains (losses) after taxOther Comprehensive Income (Loss), Net of Tax, Portion of Realized Gains Attributable to ParentThis element represents Other Comprehensive Income or Loss, Net of Tax, for the period attributable to the parent entity after deducting tax portion of realized gains.Real Estate Cost of Real Estate Sold, Net of Gain (Loss)Less: Property disposals, net of gains/lossesThe amount of real estate sold during the period net of gains (losses) on sale.Real Estate Acquired Through Foreclosure Operating ExpensesAmount of operating expenses recognized during the period for real estate assets acquired through settlement or foreclosure.Operating expensesInterest Rate Concession Below Normal Market [Member]InterestRepresents the financing receivables restructured to an interest rate concession below the normal market.Represents the fair value of interest payable related to deposits at the balance sheet date.Deposit Interest Payable, Fair Value DisclosureDeposit interest payableReal Estate Acquired Through Foreclosure, Roll Forward [Table Text Block]Tabular disclosure of the change in other real estate on properties acquired through foreclosure.Schedule of activity in the other real estate owned (OREO) portfolio, net of valuation reserveAccumulated Other Comprehensive Income (Loss) [Member]Accumulated Other Comprehensive Income (Loss)Accumulated other comprehensive lossAccumulated Other Comprehensive Income (Loss), Net of TaxAdditional paid-in capitalAdditional Paid in CapitalAdditional Paid-in Capital [Member]Additional Paid-In CapitalAdjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]Adjustments to reconcile net loss to net cash provided by operating activities:Adjustments to Additional Paid in Capital, Warrant IssuedIssuance of stock warrantsAdjustments to Additional Paid in Capital, Income Tax Benefit from Share-based CompensationTax effect from vesting of restricted stockAdjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period RecognitionStock based compensationAdvertising ExpenseAdvertising expenseAllocated Share-based Compensation ExpenseTotal compensation costAllowance for Loan and Lease Losses, Recoveries of Bad DebtsRecoveriesAllowance for Credit Losses on Financing Receivables [Table Text Block]Schedule of changes in the allowance for loan losses by segment of loans based on method of impairmentAllowance for Loan and Lease Losses, Write-offsCharge-offsAllowance for Loan and Lease Losses, Provision for Loss, GrossProvisionAllowance for Loan and Lease Losses [Roll Forward]Allowance for loan lossesAmortization of Intangible AssetsAmortization of core deposit and other intangible assetsAmortization of core deposit and other intangible assetAmortization of Mortgage Servicing Rights (MSRs)Loss on transfer of mortgage servicing rightsAntidilutive Securities Excluded from Computation of Earnings Per Share, AmountNumber of antidilutive options excluded from the diluted earnings per share calculation (in shares)Asset-backed Securities [Member]Asset-backed securitiesAssets, Fair Value DisclosureTotal financial assetsAssets at fair valueTotalAssetsAssets [Abstract]Total assetsAssetsAssets, Fair Value Disclosure [Abstract]Assets:Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair ValueLess than 12 months in an unrealized loss positionAvailable-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Fair ValueDue after one year through five yearsSecurities not due at a single maturity dateFair ValueAvailable-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair ValueAvailable-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]Fair ValueAvailable-for-sale Securities, Fair Value DisclosureSecurities available-for-saleInvestment securities available-for-saleAvailable-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair ValueDue in one year or lessAvailable-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Fair ValueDue after five years through ten yearsAvailable-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Amortized Cost BasisDue after one year through five yearsSecurities available-for-saleAvailable-for-sale SecuritiesFair ValueTotalAvailable-for-sale Equity Securities, Amortized Cost BasisEquity securitiesAvailable-for-sale Securities, Equity SecuritiesEquity securitiesAvailable-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair ValueGreater than 12 months in an unrealized loss positionAvailable-for-sale Securities, CurrentShort-term securities available-for-saleAvailable-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost BasisSecurities not due at a single maturity dateAmortized CostAvailable-for-sale Securities, Continuous Unrealized Loss Position, Fair ValueTotalAvailable-for-sale Securities, Debt Maturities, Rolling after Year Ten, Amortized Cost BasisDue after ten yearsAvailable-for-sale Securities, Gross Unrealized LossesGross Unrealized LossesGross Unrealized LossAvailable-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]Fair ValueAvailable-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]Number of SecuritiesAvailable-for-sale Securities, Debt Maturities, Rolling after Year Ten, Fair ValueDue after ten yearsAvailable-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost BasisDue in one year or lessAvailable-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract]Amortized CostAvailable-for-sale Securities, Continuous Unrealized Loss Position [Abstract]Unrealized LossesAvailable-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Amortized Cost BasisDue after five years through ten yearsAvailable-for-sale Securities, Amortized Cost BasisAmortized CostTotalAvailable-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of PositionsTotalBank Overdrafts [Member]OverdraftBank-owned life insurance (BOLI)Bank Owned Life InsuranceBank-owned life insuranceBank Owned Life Insurance IncomeIncrease in cash surrender value of bank-owned life insuranceIncrease in cash surrender value of bank-owned life insuranceRegulatory & Capital MattersBusiness CombinationBusiness Combination Disclosure [Text Block]Business CombinationCapital [Abstract]Total capital to risk weighted assets, AmountCapitalActual at period endCapital to Risk Weighted AssetsRisk-based capital ratio (as a percent)Capital Required for Capital Adequacy to Risk Weighted AssetsMinimum Required for Capital Adequacy Purposes (as a percent)Capital Required to be Well Capitalized to Risk Weighted AssetsMinimum Required to Be Well Capitalized (as a percent)Capital Required for Capital AdequacyMinimum Required for Capital Adequacy PurposesCapital Required to be Well CapitalizedMinimum Required to Be Well CapitalizedCarrying (Reported) Amount, Fair Value Disclosure [Member]Carrying AmountCash and Due from BanksCash and due from banksCash and Due from Banks.Cash and cash equivalentsCash, Cash Equivalents, and Federal Funds SoldCash and cash equivalents at beginning of periodCash and cash equivalents at end of periodCash, due from banks and federal funds soldClass of Stock [Line Items]Common and preferred stockClass of Warrant or Right, Exercise Price of Warrants or RightsWarrants, exercise price (in dollars per share)Class of Stock [Domain]Class of Warrant or Right, Number of Securities Called by Warrants or RightsWarrants to purchase the Company's common stock, initially authorized (in shares)Collateralized Mortgage Obligations [Member]Collateralized mortgage obligationsCollateralized Debt Obligations [Member]Collateralized debt obligationsCommercial Real Estate Portfolio Segment [Member]Real Estate CommercialReal estate - commercialCommercial real estateCommercial Portfolio Segment [Member]CommercialReal Estate ConstructionReal estate - constructionConstructionCommercial Real Estate Construction Financing Receivable [Member]CommitmentsCommitments and Contingencies Disclosure [Text Block]CommitmentsCommitments and contingencies (see note 18)Commitments and ContingenciesCommon Stock [Member]Common StockCommon stock, shares outstandingCommon Stock, Shares, OutstandingEnding number of shares (in shares)Common stockCommon Stock, Value, IssuedCommon stock, shares issuedCommon Stock, Shares, IssuedDividends declared per share (in dollars per share)Common Stock, Dividends, Per Share, DeclaredCommon stock, par value (in dollars per share)Common Stock, Par or Stated Value Per ShareCommon stock, shares authorizedCommon Stock, Shares AuthorizedRetirement PlansCompliance with Regulatory Capital Requirements under Banking Regulations [Line Items]Regulatory & Capital MattersOther Comprehensive Income (Loss)Comprehensive Income (Loss), Net of Tax, Attributable to ParentComprehensive income (loss)Comprehensive Income (Loss) Note [Text Block]Other Comprehensive Income (Loss)Comprehensive Income [Member]Comprehensive LossParent Company Condensed Financial InformationCondensed Financial Information of Parent Company Only Disclosure [Text Block]Parent Company Condensed Financial InformationConsumer Portfolio Segment [Member]ConsumerContractual ObligationTotal letters of creditCorporate Bond Securities [Member]Corporate bondsCredit Facility [Domain]Credit Facility [Axis]Doubtful [Member]DoubtfulDebt Instrument, Description of Variable Rate BasisVariable interest rate baseDebt Instrument [Line Items]BorrowingsJunior subordinated debenturesSchedule of Long-term Debt Instruments [Table]Debt Instrument, Fair Value DisclosureNotes payable and other borrowingsDebt Disclosure [Text Block]BorrowingsBorrowingsTotal borrowingsDebt, Long-term and Short-term, Combined AmountDebt Instrument, Basis Spread on Variable RateBasis points added to reference rate (as a percent)Debt Instrument [Axis]Debt Instrument, Face AmountFace amountDebt Instrument, Name [Domain]Debt Instrument, Increase, Additional BorrowingsAmount issued to trustDeferred Income Tax Expense (Benefit)Provision for deferred tax expenseDeferred Tax Assets, Net of Valuation AllowanceDeferred tax asset, netDefined Contribution Plan, Cost RecognizedDeposit Liabilities Disclosures [Text Block]DepositsTotal depositsDeposits.Deposits, Negotiable Order of Withdrawal (NOW)NOW accountsDeposits:Deposits [Abstract]Deposits, Money Market DepositsMoney market accountsDeposits, Fair Value DisclosureDepositsDeposits, Savings DepositsSavingsDepositsDepreciation, Depletion and AmortizationDepreciation and amortization of leasehold improvementDepreciationDepreciationDerivative Instrument Risk [Axis]Derivative AssetsOther assetsAsset Derivatives, Fair ValueDerivative [Line Items]Financial Instruments with Off-Balance Sheet Risk and Derivative TransactionsCompany's contractual commitments due to letters of creditFinancial Instruments with Off-Balance Sheet Risk and Derivative TransactionsDerivative Instruments and Hedging Activities Disclosure [Text Block]Derivative LiabilitiesOther liabilitiesLiability Derivatives, Fair ValueDerivative, Average Remaining MaturityWeighted average maturityDerivative [Table]Financial Instruments with Off-Balance Sheet Risk and Derivative TransactionsDerivative Contract Type [Domain]Disclosure of Compensation Related Costs, Share-based Payments [Text Block]Long-Term Incentive PlanLong-Term Incentive PlanDividend Income, OperatingDividends from Federal Reserve Bank and Federal Home Loan Bank stockDividends, Share-based Compensation, StockUn-vested share-based payment awardsDividends, Common StockDividends declared, $.02 per shareCommon stock dividendsDividends PayableChange in dividends declared not paidDividends, Preferred StockPreferred dividends declared and accrued (5% per preferred share)Earnings Per Share, Basic [Abstract]Basic earnings (loss) per share:Earnings Per Share, DilutedDiluted loss per share (in dollars per share)Diluted loss per shareEarnings Per Share, Diluted [Abstract]Diluted loss per share:Earnings Per Share, BasicBasic loss per share (in dollars per share)Basic loss per share (in dollars per share)Earnings Per Share, Basic, DistributedBasic loss per share common distributed earnings (in dollars per share)Earnings Per Share, Basic, UndistributedBasic loss per share common undistributed (in dollars per share)Earnings Per Share [Text Block]Earnings (Loss) Per ShareLoss Per ShareEmployee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for RecognitionExpected weighted-average period for recognition of unrecognized compensationEmployee Service Share-based Compensation, Tax Benefit from Compensation ExpenseTotal income tax benefitEmployee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock OptionsTotal unrecognized compensation costEmployee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than OptionsTotal unrecognized compensation cost of restricted awardsEquipment ExpenseFurniture and equipment expensePreferred StockEquity Component [Domain]Fair value, preferred stockEquity, Fair Value DisclosureEquity Method Investee, Name [Domain]Equity Securities [Member]Equity securitiesEstimate of Fair Value, Fair Value Disclosure [Member]Fair ValueTotalExcess Tax Benefit (Tax Deficiency) from Share-based Compensation, Operating ActivitiesTax effect on vesting of restricted stockMeasurement Frequency [Axis]Fair Value by Asset Class [Domain]Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3Transfers into Level 3Fair Value, Hierarchy [Axis]Fair Value Inputs, Discount RateDiscount rate (as a percent)Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3Transfers out of Level 3Fair Value, Measurements, Recurring [Member]Recurring basisFair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability ValueBalance at the beginning of the periodBalance at the end of the periodFair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, SettlementsSettlementsFair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, SettlementsSettlementsFair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, Sales, Issues, Settlements [Abstract]Purchases, issuances, sales, and settlementsFair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, IssuesIssuancesFair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, Sales, Issues, Settlements [Abstract]Purchases, issuances, sales, and settlementsFair Value, Measurement Frequency [Domain]Fair Value Measurements, Recurring and Nonrecurring [Table]Asset Class [Axis]Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in EarningsIncluded in earnings (or changes in net assets)Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3Transfers into Level 3Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, PurchasesPurchasesFair Value, Measurements, Fair Value Hierarchy [Domain]Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3Transfers out of Level 3Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, IssuesIssuancesFair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]Assets and liabilities measured at fair value on a recurring basisAssets and liabilities measured at fair valueFair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)Included in other comprehensive incomeFair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, PurchasesPurchasesFair Value Option and Fair Value MeasurementsFair Value Disclosures [Text Block]Fair Value Option and Fair Value MeasurementsFair Value, Measurements, Nonrecurring [Member]Nonrecurring basisFair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]Changes in Level 3Fair Values of Financial InstrumentsFair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]Fair Value Measurements, Nonrecurring [Table Text Block]Schedule of assets and liabilities measured at fair value on a nonrecurring basisFair Value, by Balance Sheet Grouping [Table Text Block]Schedule of carrying amount and estimated fair values of financial instrumentsFair Value, Disclosure Item Amounts [Domain]Fair Value, by Balance Sheet Grouping [Table]Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis]Fair Value, Inputs, Level 3 [Member]Level 3Fair Value, Inputs, Level 1 [Member]Level 1Fair Value, Inputs, Level 2 [Member]Level 2Subordinated Debt Obligations, Fair Value DisclosureSubordinated debentureFair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in EarningsIncluded in earnings (or changes in net assets)Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]Changes in Level 3Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)Included in accumulated other comprehensive lossFair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset ValueBalance at the beginning of the periodBalance at the end of the periodFair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]Federal Home Loan Bank Advances [Member]FHLB advancesFederal Funds Purchased, Fair Value DisclosureFederal funds purchasedFederal Home Loan Bank Stock and Federal Reserve Bank StockFHL BC and FRB stockFederal Home Loan Bank and Federal Reserve Bank stockFederal funds soldFederal Funds SoldFederal Home Loan Bank StockFHLBC stockBank owned FHLBC stockFederal funds purchasedFederal Funds PurchasedFederal Deposit Insurance Corporation Premium ExpenseFDIC insuranceFederal Reserve Bank StockFRB stockFederal Reserve Bank Advances [Member]FRBFees and Commissions, Fiduciary and Trust ActivitiesTrust incomeFees and Commissions, Mortgage BankingSecondary mortgage feesFees and Commissions, Depositor AccountsService charges on depositsFinance Leases Financing Receivable [Member]Lease financing receivablesFinancial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]Financial liabilities:Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]Financial assets:Financial Instrument [Axis]Financial Standby Letter of Credit [Member]Financial standby letters of creditFinancing Receivable, Recorded Investment, Past Due [Line Items]Aged analysis of past due loansFinancing Receivable Allowance [Domain]Financing Receivable, Modifications [Line Items]Troubled debt restructuringsFinancing Receivable, Recorded Investment, 90 Days Past Due and Still AccruingRecorded Investment 90 days or Greater Past Due and AccruingFinancing Receivable, Recorded Investment, Nonaccrual StatusNonaccrualFinancing Receivable, Allowance for Credit Losses [Line Items]Changes in the allowance for loan losses by segment of loans based on method of impairmentFinancing Receivable, Allowance for Credit Losses, Individually Evaluated for ImpairmentEnding balance: Individually evaluated for impairmentFinancing Receivable, Recorded Investment [Line Items]Loans by risk ratingFinancing Receivable, Recorded Investment, 30 to 59 Days Past Due30-59 Days Past DueCredit Quality Indicator [Axis]Financing Receivable, Modifications, Recorded InvestmentRecorded investmentPortfolio Segment [Axis]Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due90 Days or Greater Past DueFinancing Receivable, Recorded Investment, 60 to 89 Days Past Due60-89 Days Past DueFinancing Receivable, Allowance for Credit Loss, Additional Information [Abstract]LoansFinancing Receivable, Impaired [Line Items]Analysis of impaired loansFinancing Receivable, Modifications, Number of Contracts# of contractsFinancing Receivable, Individually Evaluated for ImpairmentEnding balance: Individually evaluated for impairmentFinancing Receivable, by Credit Quality Indicator [Domain]Financing Receivable, Recorded Investment, CurrentCurrentFinancing Receivable Credit Quality Indicators [Table Text Block]Schedule of credit quality indicators by class of loansFinancing Receivable, Recorded Investment, Past DueTotal Past DueFinancing Receivable, Collectively Evaluated for ImpairmentEnding balance: Collectively evaluated for impairmentFinancing Receivable, Allowance for Credit Losses, Collectively Evaluated for ImpairmentEnding balance: Collectively evaluated for impairmentFinite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]Estimated future amortization expense for core deposit and other intangiblesFinite-Lived Intangible Assets, Amortization Expense, Year FiveFinite-Lived Intangible Assets, Amortization Expense, after Year FiveFinite-Lived Intangible Assets, Amortization Expense, Year FourFinite-Lived Intangible Assets, Amortization Expense, Year TwoFinite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal YearCore deposit intangible assets, netFinite-Lived Intangible Assets, NetTotalForward Contracts [Member]Forward contractsForward MBSGain (Loss) Related to Litigation SettlementLitigation related incomeGain (Loss) on Sale of DerivativesNet interest rate swap gains and feesGain (Loss) on Sale of Mortgage LoansNet gain on sales of mortgage loansNet gain on sales of mortgage loansGain (Loss) on Sale of Securities, NetSecurities gains (losses), netSecurities gains, netGains (Losses) on Sales of Other Real EstateNet gain on sale of other real estate ownedNet gain on sale of other real estate ownedGain on sales, netGeneral Insurance ExpenseGeneral bank insuranceGoodwillGoodwillGoodwill and Intangible Assets Disclosure [Text Block]Goodwill, Impairment LossImpairment of goodwillCore Deposit IntangibleGuarantor Obligations, Nature [Axis]Guarantor Obligations, Nature [Domain]Hedging Designation [Axis]Hedging Designation [Domain]Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]Interest Income RecognizedImpaired Financing Receivable, with No Related Allowance, Interest Income, Accrual MethodWith no related allowance recordedImpaired Financing Receivable, with Related Allowance, Average Recorded InvestmentWith an allowance recordedImpaired Financing Receivable, Average Recorded Investment [Abstract]Average Recorded InvestmentImpaired Financing Receivable, Unpaid Principal Balance [Abstract]Unpaid Principal BalanceImpaired Financing Receivables [Table Text Block]Schedule of impaired loans by class of loanImpaired Financing Receivable, with Related Allowance, Recorded InvestmentWith an allowance recordedImpaired Financing Receivable, with Related Allowance, Interest Income, Accrual MethodWith an allowance recordedImpaired Financing Receivable, Average Recorded InvestmentTotal impaired loansImpaired Financing Receivable, with No Related Allowance, Unpaid Principal BalanceWith no related allowance recordedImpaired Financing Receivable, Unpaid Principal BalanceTotal impaired loansImpaired Financing Receivable, Recorded InvestmentTotal impaired loansImpaired Financing Receivable, with No Related Allowance, Recorded InvestmentWith no related allowance recordedImpaired Financing Receivable, Related AllowanceWith an allowance recordedValuation allowanceImpaired Financing Receivable, with No Related Allowance, Average Recorded InvestmentWith no related allowance recordedImpaired Financing Receivable, with Related Allowance, Unpaid Principal BalanceWith an allowance recordedImpaired Financing Receivable, Interest Income, Accrual MethodTotal impaired loansImpaired Financing Receivable, Recorded Investment [Abstract]Recorded InvestmentWrite-down of other real estate owned expensedImpairment of Real EstateConsolidated Statements of OperationsIncome TaxesIncome Tax Disclosure [Text Block]Income TaxesProvision (Benefit) for income taxesIncome (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling InterestIncome (loss) before income taxesIncome taxesIncome Tax Expense (Benefit)Income Taxes Paid, NetIncome taxes receivedIncrease (Decrease) in DepositsNet change in depositsIncrease (Decrease) in Income Taxes PayableChange in current income taxes receivableIncrease (Decrease) in Federal Funds PurchasedNet change in federal funds purchasedIncrease (Decrease) in Stockholders' EquityIncrease (Decrease) in Stockholders' Equity [Roll Forward]Incremental Common Shares Attributable to Share-based Payment ArrangementsDilutive effect of share-based payment arrangements (in shares)Interest PayableBorrowing interest payableInterest and Dividend Income, Operating [Abstract]Interest and Dividend IncomeInterest and Fee Income, Loans and LeasesLoans, including feesInterest ExpenseTotal interest expenseInterest and Dividend Income, OperatingTotal interest and dividend incomeInterest Expense [Abstract]Interest ExpenseInterest and Fee Income, Loans Held-for-sale, MortgagesLoans held-for-saleInterest and Dividend Income, Securities, by Taxable Status [Abstract]Securities:Interest Income, Federal Funds SoldFederal funds soldInterest Expense, Federal Funds PurchasedFederal funds purchasedInterest Expense, Time DepositsTime depositsInterest Income, Deposits with Financial InstitutionsInterest bearing deposits with financial institutionsInterest Expense, Junior Subordinated DebenturesJunior subordinated debenturesInterest Expense, NOW Accounts, Money Market Accounts, and Savings DepositsSavings, NOW, and money market depositsInterest Expense, Subordinated Notes and DebenturesSubordinated debtInterest Income (Expense), NetNet interest and dividend incomeInterest Expense, DebtNotes payable and other borrowingsInterest Expense, Short-term BorrowingsOther short-term borrowingsInterest Expense, Securities Sold under Agreements to RepurchaseSecurities sold under repurchase agreementsInterest Income, Securities, Tax ExemptTax exemptInterest Income (Expense), after Provision for Loan LossNet interest and dividend income after provision for loan lossesInterest bearing:Interest-bearing Deposit Liabilities [Abstract]Interest Rate Swap [Member]